feat: improve currency interruption screen display

app/helpers/interruption_screen_helper.rb

@@ -7,10 +7,12 @@ module InterruptionScreenHelper
       value = if argument["label"]
                 pre_casing_value = lettings_log.form.get_question(argument["key"], lettings_log).answer_label(lettings_log)
                 pre_casing_value.downcase
+              elsif argument["currency"]
+                ["£", ActionController::Base.helpers.number_to_currency(lettings_log.public_send(argument["key"]), delimiter: ",", format: "%n")].join("")
               else
                 lettings_log.public_send(argument["key"])
               end
-      translation_params[argument["i18n_template"].to_sym] = argument["prefix"] == "£" ? "£#{ActionController::Base.helpers.number_to_currency(value, delimiter: ',', format: '%n')}" : value
+      translation_params[argument["i18n_template"].to_sym] = value
     end
 
     begin
@@ -30,10 +32,12 @@ module InterruptionScreenHelper
     arguments.each do |argument|
       value = if argument["label"]
                 lettings_log.form.get_question(argument["key"], lettings_log).answer_label(lettings_log).downcase
+              elsif argument["currency"]
+                ["£", ActionController::Base.helpers.number_to_currency(lettings_log.public_send(argument["key"]), delimiter: ",", format: "%n")].join("")
               else
                 lettings_log.public_send(argument["key"])
               end
-      translation_params[argument["i18n_template"].to_sym] = argument["prefix"] == "£" ? "£#{ActionController::Base.helpers.number_to_currency(value, delimiter: ',', format: '%n')}" : value
+      translation_params[argument["i18n_template"].to_sym] = value
     end
     I18n.t(title_text["translation"], **translation_params).to_s
   end

app/models/form/sales/pages/about_price_shared_ownership_value_check.rb

@@ -24,7 +24,7 @@ class Form::Sales::Pages::AboutPriceSharedOwnershipValueCheck < ::Form::Page
           "key" => "purchase_price_soft_min_or_soft_max",
           "label" => false,
           "i18n_template" => "soft_min_or_soft_max",
-          "prefix" => "£",
+          "currency" => true,
         },
         {
           "key" => "purchase_price_min_or_max_text",